counter = 100
miles = 1000.0
name = "zhangfeng"

print(counter)
print(miles)
print(name)

a,b,c,d = 20,5.5,True,4+3j

print(type(a))
print(type(b))
print(type(c))
print(type(d))
if isinstance(a,int):

    print("true")
else:
    print("false")

str = "zhangfeng"

print(str)

print(str[0:-1])
print(str[0])
print(str[2:5])
print(str[2:])
print(str * 2)
print(str+"TEST")

print("zha\ngfeng")

print(r"zha\ngfeng")